Cleanup CFWL_Widget code to return CFX_RectFs where appropriate

xfa/fwl/cfwl_combolist.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fwl/cfwl_combolist.h"
 
 #include <memory>
 #include <utility>
@@ skipping 44 matching lines @@
   }
   if (hItem) {
     CFX_RectF rect;
     CFWL_ListItem* hItem = GetItem(this, iSel);
     GetItemRect(this, hItem, rect);
     rtInvalidate.Union(rect);
     CFWL_ListItem* hSel = GetItem(this, iSel);
     SetSelItem(hSel, true);
   }
   if (!rtInvalidate.IsEmpty())
-    Repaint(&rtInvalidate);
+    RepaintRect(rtInvalidate);
 }
 
 void CFWL_ComboList::ClientToOuter(FX_FLOAT& fx, FX_FLOAT& fy) {
   fx += m_pProperties->m_rtWidget.left, fy += m_pProperties->m_rtWidget.top;
   CFWL_Widget* pOwner = GetOwner();
   if (!pOwner)
     return;
   pOwner->TransformTo(m_pOuter, fx, fy);
 }
 
@@ skipping 153 matching lines @@
       CFWL_ListItem* hItem = GetItem(this, pOuter->GetCurrentSelection());
       hItem = GetListItem(hItem, dwKeyCode);
       if (!hItem)
         break;
 
       SetSelection(hItem, hItem, true);
       ScrollToVisible(hItem);
       CFX_RectF rtInvalidate;
       rtInvalidate.Set(0, 0, m_pProperties->m_rtWidget.width,
                        m_pProperties->m_rtWidget.height);
-      Repaint(&rtInvalidate);
+      RepaintRect(rtInvalidate);
       break;
     }
     default:
       break;
   }
 }